| 摘要 |
The yield of aromatic ether imides prepared by reacting a substituted phthalimide (such as 4-nitro-N-methylphthalimide) with an alkali metal salt of a hydroxyaromatic compound (such as the disodium salt of bisphenol A) in the presence of a phase transfer catalyst is improved by conducting the reaction in o-dichlorobenzene as diluent. When the reaction mixture is subsequently extracted with water and/or aqueous alkali, o-dichlorobenzene can also be used in recovery of the phase transfer catalyst from the aqueous phase by extraction thereof. Such recovery is improved by dissolving a substantial amount of inorganic salt in the aqueous phase and by conducting the o-dichlorobenzene extraction at elevated temperatures.
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